Effect of age on the relationship between metabolizable energy and digestible energy for broiler chickens

Poultry Science

H.M. Yang¹  V.R. Pirgozliev²  M.R. Bedford³  Z. Yang⁴  Z.Y. Wang⁵  S.P. Rose⁵  S. Woods⁵ 

[1] Corresponding author;The National Institute of Poultry Husbandry, Harper Adams University, Edgmond, Newport, Shropshire, TF10 8NB, UK;College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province 225009, P. R. China;Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu Province 225009, P. R. China;The National Institute of Poultry Husbandry, Harper Adams University, Edgmond, Newport, Shropshire, TF10 8NB, UK;

关键词: age;    broiler;    metabolizable energy;    digestible energy;    diet;   

DOI  :  

来源: DOAJ

【 摘 要 】

ABSTRACT: A total of 960 male Ross 308 chicks (day-old) were used to investigate the effect of age on the relationship between metabolizable energy (ME) and digestible energy (DE) for broiler chickens. Bird growth variables, nitrogen retention (NR), nitrogen digestibility (ND), as well as the relative weight of liver, pancreas, and the gastrointestinal tract were determined. Practical diets that compared 2 cereals (corn and wheat) and exogenous xylanase (0 or 16,000 BXU/kg) were evaluated at 5 ages (7, 14, 21, 28, and 35 D) in a 2 × 2 × 5 factorial arrangement of treatments with 8 replicates per treatment and started with 30 birds per replicate. A randomized block ANOVA analysis of repeated measures was performed, and a 2 × 2 × 5 factorial structure was used to investigate the 2 dietary treatment factors (cereal type and the presence of xylanase) within the 5 bird ages (7, 14, 21, 28, and 35 D), and their interactions. Apparent metabolizable energy (AME) increased linearly from 7 until 28 D of age, but (P < 0.05) decreased at 35 D of age. Digestible energy was high at 7 D of age, then dropped and remained similar (P > 0.05) from 14 to 35 D of age. The AME: DE ratio was lowest (P < 0.05) at 7 D of age but there were no (P > 0.05) differences thereafter. Cereal type and xylanase supplementation did not (P > 0.05) change the ME: DE ratio. The results indicate that determining ME before 14 D of age may give absolute values that are lower than would be obtained with older birds. ME values that are determined on older broiler chickens may overestimate the energy availability of practical feeds used in broiler starter feeds.

【 授权许可】

Unknown